International audienceThis article aims to supplement research on the class situations by taking into account the students’ point of view aboutwhat makes them work. His interactionist approach questions the problems of school education in terms of precision ofknowledge but also of justice in relations between students and adults. It also adopts a didactic point of view that deinesthe conditions necessary for teachers and students to carry out joint actions. The methodology of the survey is based oninterviews with about ifty students from socially contrasted schools analyzing video sequences of classes of the same levelgiven by a French teacher and a mathematics teacher. The markedly different success of the two ilmed teachers forcesstudents...